eliminating more stubbing specs from config_spec
eliminating more stubbing specs from config_spec

Using more real filesystem operations.

Also introducing a build_temp_dir test helper that will bypass the
/private/tmp -> /tmp symlink issue encountered on OSX, allowing
the two "TODO"d specs to be implemented.

flogic/whiskey_disk,pbrumm/whiskey_disk,openlogic/whisk,flogic/whiskey_disk,pbrumm/whiskey_disk,openlogic/whisk,flogic/whiskey_disk,pbrumm/whiskey_disk,openlogic/whisk,kingandpartners/whiskey_disk